Improvement in locks



UNITED STATES PATENT JAMES W. MILLER, OF WAYNESBOROUGH, ASSIGNOR TOHIMSELF AND JOSEPH SNIVELY, JR., OF GREENOASTLE, PENNSYLVANIA.

IMPROVEMENT IN LOCKS.

Specification forming partot' Letters Patent No. 4 3,078, dated June T,1864.

.To aZZ whom it may concern:

Be it known that l, JAMES W. MILLER, of wlaynesborough, in the county ofFranklin and State of Pennsylvania, have invented a certain new anduseful Improvement on Locks; and I do hereby declare the following to bea full, clear, and exact description thereof, ret'- erence being had tothe accompanying drawings, and to the letteis and marks thereon.

My improvement is more particularly intended to be used on barn andstable doors, but, like most locks, can be used elsewhere.

By the drawings forming a part of this specification my lock is shown soconstructed as to be attached to a frame, which can be at'- fixed to'thedoor orto the. door-frame, but as is evident the look may be attacheddirectly to the door or door-frame.

Figure l of these drawings shows the lock a, attached to a frame, b, andalso shows a bolt or slotted bar, c, which is connected to the door, thebolt of the lock passing through a slot in the end of the bar c. Fig. 2is a view of the lock detached and showing its interior structure; Fig.3, a view by transverse section 3' Fige, aview of the key-hole protectorFig. 5, a view ot' the key, and Fig. 6 a view of the slotted bar odetached.

In each of these gures, where like parts are shown, like letters andmarks are used to indiy cate the parts.

yA flat spring, l1., serves by friction to hold the bolt d whenunlocked, and to act as a tumbler or guard plate to the bolt whenlocked, as its end rests directly against the bolt, as is shown by blacklines in Fig. 3. There are two keyholes, i andj. Through the one thebolt is locked by simply forcing it down with the key k, and through theother the bolt is unlocked by screwing the key into the bolt, the bit lof l the key forcing back the spring It at each turn of the key andholding it back when screwed home, so that the bolt is easily unlocked.The key screwed in the bolt and the bolt in the slot or hole of the barc are shown by black lines in Fig. 2. In unlocking a little pressure ofthe key .toward the spring will aid the bit l in keeping the springbackfrom the bolt.l The key-hole j is protected by a plate, m. This platehas on its inner surface a projecting piece, a, which acts as a catch`by simply turning the plate half-way round after the piece a is placed'in the key-hole. When this plate is attached to the one keyhole, thclock being locked and the key withdrawn, the plate appears merely as akey-hole cover, and any .person attempting to pick the lock would bedeceived by this plate and would, without fully knowing the structure ofthe lock and having a proper key, be un able to unlock the lock.

What I claim as my invention, and desire by Letters Patent, is

1. The combination of the bolt d and spring h with the key k, whenconstructed and operated as recited herein.

2. The plate m, in combination with the lock y and key, substantially asand for the purposes herein set forth.

This specification signed this 11th day of April, 1864.

VJAMES W. MILLER.

Witnesses:

J oHN KAUFEMAN, J'. A. Hans.

